[split] Bug in new form validation?

Solved the initial issue, however there still exists the subsequent deprecation error.

Versions:

PHP Version 7.2.2
intl version 1.1.0
ICU version 4.2.1
ICU TZData version 2009j
ICU Unicode version 5.1

Error:

A PHP Error was encountered
Severity: 8192
Message: idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated
Filename: libraries/Form_validation.php
Line Number: 1237
Backtrace:
File: /home/mysite/public_html/application/controllers/User.php
Line: 32
Function: run
File: /home/mysite/public_html/index.php
Line: 315
Function: require_once

Yes, that can't be resolved by CI.

INTL_IDNA_VARIANT_2003 is deprecated since PHP 7.2, but is the only option available if you don't have ICU 4.6+ ... this was already mentioned in the thread.

Upgrade ICU.

I get that CI can't solve it, but my point is that this IS the current version of ICU for CentOS 6.